iommu/amd: Fix unity mapping initialization race

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commit 522e5cb76d upstream.

There is a race condition in the AMD IOMMU init code that
causes requested unity mappings to be blocked by the IOMMU
for a short period of time. This results on boot failures
and IO_PAGE_FAULTs on some machines.

Fix this by making sure the unity mappings are installed
before all other DMA is blocked.

Fixes: aafd8ba0ca ('iommu/amd: Implement add_device and remove_device')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Joerg Roedel 2016-07-01 16:42:55 +02:00 • committed by Greg Kroah-Hartman

parent 72803a72a6

commit e205592b31

1 changed files with 12 additions and 2 deletions

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drivers/iommu/amd_iommu_init.c

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